First separate one game from the overall problem
Write down the time, game name and full message. Try another Roblox game on the same device. If only some games open, the result is important for contacting the author of a particular project. If nothing works, check Roblox Status and the availability of the official Roblox website. The status page shows platform failures, but the absence of an incident does not prove that your network is healthy. Repeat the test under the same conditions so that an accidental successful connection is not mistaken for the found reason.
Compare connection
The official help suggests trying another available Internet connection. To test Wi-Fi on a computer, you can compare it with a wired connection; on the phone - with a mobile network, if available. Write down where the error occurred. When a failure occurs on only one network, this information is useful to the provider or administrator. This test is diagnostic and does not guarantee that any other connection will correct the cause.
What to check on your phone
Close Roblox completely, then restart your device. Check that the date and time are correct and log into the same game again. The instructions for Roblox for iOS and Android also provide for reinstallation from the App Store or Google Play. Before you do so, make sure you know how to log into your account. The application closing menu and time settings vary by phone. Don't use Windows commands on your mobile device: choose your system's Help section.
PC: client, permissions and support
On Windows, update or reinstall the official client. Check whether the installed network protection is blocking Roblox; For a managed computer, contact the administrator with the error text. There is no need to disable protection for the entire system. If simple checks do not help, use the official section of your OS: it contains additional steps with local application data. Send support your username, device model, OS, exact code and procedure. Explain if another game and another network works.
Sources and checks
Guides are automatically translated from Russian; interface labels may differ. The Russian edition is the original.